METHOD FOR CONTROLLING AND OPTIMIZING INDUSTRIAL PROCESS FOR MANUFACTURING DYESTUFF, FLUORESCENT WHITENING AGENT AND INTERMEDIATE THEREOF

摘要

PURPOSE: To optimize the industrial process for the preparation of dyes, fluorescent whitening agents or the like by controlling the preparation process of dyes or the like by differential analysis of UV/visible ray absorption spectra of the starting material and the reaction product. CONSTITUTION: The chemical industrial process to prepare dyes, fluorescent whitening agents and their intermediates is controlled and optimized by differential analysis of UV/visible ray absorption. spectra of at least one starting material and at least one reaction product. For example, production of monoazo or polyazo dyes, metal complex salt dyes, anthraquinone dyes, phthalocyanine dyes, formazane dyes or the like is controlled and optimized by differential analysis of UV/visible ray absorption spectra of the starting material and the reaction product.